>>723945731
It's not the end of the world. It's kind of fucky because each CM is on different grounds, and aces are going to want different skills each race. Like if you're in the SMaruzensky mines, you need a new groundwork parent every time to account for the green skills.
What you can best do to mitigate this is get 3* stam/pow generically good grandparents, which you can then use with a specialized rental grandparent to make a specialized parent for a specific ace for specific cup conditions.
Or say fuck that and just run lates who typically care a lot less.